Abstract:In this paper, by exploiting Sentinel-1A satellite ascending and descending data, we obtain a three-dimensional coseismic deformation field and source parameters by using synthetic aperture radar differential interferometry(DInSAR) and Okada uniform sliding model inversion. The results show that the fault slip caused by this earthquake is generally along the north-south direction, and the uplift occurs in the middle of the subsidence area on both sides, with the maximum vertical deformation around 18 mm. The seismogenic fault parameters of the Rongxian earthquake accords with the characteristics of the reverse fault, having length of about 9.5 km and width of about 2.1 km. The accumulative deformation in the study area from 2018-11 to 2019-03 is obtained using time series analysis technique. The results suggest that the deformation fluctuation in this area is stable before and after the earthquake, and the earthquakes are the main reason for the large accumulative deformation in the area.
ZHANG Zihao,JIANG Liming,CHEN Yuxing. Preliminary Analysis of InSAR Coseismic and Time Series Deformation of Rongxian Earthquake[J]. jgg, 2020, 40(7): 671-676.